Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Nonequilibrium Quantum Many-Body Systems 1 (joint session TT/DY)

TT 4.8: Vortrag

Montag, 1. April 2019, 11:30–11:45, H22

Steady-state charge transport through Falicov-Kimball system connected to metallic leads — Martin Žonda and •Michael Thoss — Institute of Physics, Albert-Ludwig University of Freiburg, Hermann-Herder-Strasse 3, 791 04 Freiburg, Germany

We study steady-state nonequilibrium charge transport in a model heterostructure, where a two-dimensional spin-less Falicov-Kimball system is coupled to two noninteracting leads, using a combination of a sign-problem-free Monte Carlo approach and nonequilibrium Green’s function techniques. We show that the transport characteristic depends sensitively on the electrostatic potential in the system and exhibits different properties for different phases of the Falicov-Kimball model. In particular, pronounced step-like changes of the current and transmission are observed at the phase boundaries, evident even on a logarithmic scale. Analyzing finite size effects, we find that with the method used a relatively small system can be utilized to address specific thermodynamic limits.